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Hi Andrew and welcome. This UPC code has a Barrel Length of 3.4". Cheers and stay safe!

Andrew, the 3.1 is a description error. This has a 3.4 inch barrel. Hope this helps.

Andrew, per the IWI website, this model has a 3.4" barrel. https://iwi.us/product/m9slim13/ Stay safe & have a great day!